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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc0188786cd1e39920fb8b6e10e1d11c22946cb90bcef9431b5c2dfc4716a3b' 
  AND token = 'QzHcDBYZW5q4kD7yJq47P9FOVol9sQuujSEmcSdemUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}